Space telegraphy.



PATBNTED AUG. 16, 1904.

v No. 767,993.

- J. s. STONE. I

- SPACE TELEGRAPHY.

APPLIUATIOZ! FILED JAN. 15. 1904.

H0 MODEL.

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in a souorous circuit and of impressing corre ponding o cillations in amain line or sigu 'v liL-tli j ct of that invention he.- ing to'reahze.telephonic transmission over denser C overdischarges.till it receives acharge in the oppositedirectionalmost equal to the initial charge. 'lhesparlt' then ceases to pass across the space at .\l', and the generasnchsignaling-circuit l' vatiation of the;

amplitude of an osci lator current of inaudihly high fre uencytravt'rrsing the circuit. such variation corresponding to the soundvilo'ations ol' the speech to he transmitted.

l lind that in the art of ireless telegraphv great advantages accrue h vimpressing a contor (t proceeds to charge in the initial direction tillthe potential dill'erence at .\l' is 3 again sullicient to produce adisruptive distinuous oscillatouv force upon the el vated l conductor incontradi tiuction to ])(I'l()tll\'illl impressing such oscillatory forceupon said elevated conductor in the manner heremhefore hrietly setforth.

, amplitude of electrical oscillations will result The apparatus andmethod of its operation may best he understood h v having reference tothe drawings which accompany and form a part of this speciticaticn andwhich illustrate tliagramaticallv one form of apparatus \vlicrehy thherein-descril)cd method may he conveniently carried out. however, formsuspart of this invention, having heen claimed in my application, Seriai.\'o. lazuli". tiled -.\'ovunher 25, 1903.

Figure] rcm-esents a means of continuously inn-ncssing periodicclectromotive forces upon the elevated conductor syst m h 1'. Fig. 2represents a means of continuously impressing simple harmonicelectromotive forces upon the elevated conductor s m S l).

In the ligures, V is an elevated cotnluctor. A is a key. l l aretransformers whose windings are respectively I S and P'S'. arecondensers. .\l' is a spark-gap. (i isa direct-current generator.

The circuit 1/ (i is a circuit of large electroniotive force and highresistance.

The circuit l l. .\l' is a sonorous circuit. and in Fig. 2 the circuit Cl" L 5 is a resonant weeding-out circuit, the general function of whichwas lirst s t forth h,\' Dr. Louis l)uncan in a paper pnhlished in theyivmsw- This apparatus.

in the vertical s \-stem.and theamplitudeot' said oscillations will hefar greater than if a train of a limited numhcr of el ctric oscillationshe so impressed upon the elevated conductor s vstem. The amplitude ofthe elcetron'utgnetic waves radiated from said elevated conductor istherefore correspondingl) greater and uniform.

in the system shown in Fig. 2 the resonant circuit C l" L' S is attunedto the .t'requency of the electric oscillations developed by theelectric strength of the intervening medium when a disruptive dis hargetalt'es place at.

that point. Whensuchadisruptivedischarge f taltcs place. the resistanceat that point hecomcs ahrnptLv and enormously diminished. Owing to theresistance of the generator (i, or, more generally speaking, to theimptalance ol' the circuit M a (i I}, the potential difference at Xl'immediately hecomes quite insignilicant. By virtue of theelectromagnetic inertia of the circuit Al e U 1 L I: the consonorous cirhit (7 l l. .\l'. and therefore renders the oscillator clectromotiveforces impressed upon the vertical conductor simple harmo do in form.The function of the permanentmagnet 11 s is the usual function of suchmagnet in connection with a spark-gal 1'. of extinguishing the spark.

l claim 1, The method of transmitting signals hy electromagnetic waveswhich cousistsin developing a snhstantially continuous train ofelectrical oscillations, controlling said train of tltClliCilloscillations in accordance with the signal to he transmitted. impressingsaid electrical oscillations upon an elevated conductor and then-Irvdeveloping a substantially continuous train of elm-tromagnetic waresmodilied in accordance with thesignal to he transmitted.

2'. The method of developing a coutimlous train of electronlagneticwaves which consi ts in deriving a continuous train of electrical oscillations from a source of unidirectional electromotive t'oree,impressing said train of elec trical oscillations upon an elevatedconductor and therehy transmitting a continuous train of electromagneticwaves.

3. The method of developing a continuous train of electromagnetic waveswhich consists in deriving a continuous train of electrical oscillationsfrom a source of unidirectional electromotivc force, impressing saidtrain of electrical oscillations upon a resonant circuit attuned to thefrequenev of said oscillations, and impressing the oscillationsdeveloped in the resonant circuit upon an elevated conductor.

4. The method of developing electromagnetic waves which consists incharging a conl\ It is hereby certified that in Letters Patent No.767.993, granted August 16, 1904,

, upon the application of John Stone Stone, of Cambridge. Massachusetts,for an lulprovement in "Space Telegraphy, errors appear in the printedspecification. requiring v .53 E correction, as follows: On page 1, line23,1he dash after the word "coil should be :5 t I i stricken out, and inline. 24,5:1'me page, a Collllllfl. should be inserted after the word a:3 generator; and that the smd Letters Patent should he read with thesecorrections H ES 5 thereln that the same may conlorln to the record ofthe case In the Patent Olhce. -1 3 l i Signed and sealed this 4th dayof' July, A. 1)., 1905.

w [SEAL] F. I. ALLEN, E: v v Q 3 Commissioner of Patents. H I o 1 Q) a iL- S- i 1

